docs: def currencies(self):
          """Fetches current currency data of the service
  
          :Example Data:
  
          {
              AED: "United Arab Emirates Dirham",
              AFN: "Afghan Afghani",
              ALL: "Albanian Lek",
              AMD: "Armenian Dram",
              ANG: "Netherlands Antillean Guilder",
              AOA: "Angolan Kwanza",
              ARS: "Argentine Peso",
              AUD: "Australian Dollar",
              AWG: "Aruban Florin",
              AZN: "Azerbaijani Manat"
              ...
          }
          """
          try:
              resp = self.client.get(self.ENDPOINT_CURRENCIES)
          except requests.exceptions.RequestException as e:
              raise OpenExchangeRatesClientException(e)
  
          return resp.json()